Locking cylindrical door-bolt



GHAS. G. PAGE, OF WASHINGTON, DISTRICT OF COLUMBIA.

LOCKING GYLINDRICAL DOOR-BOLT.

Specification of Letters Patent No. 17,808, dated l'uly` 14, 1857.

Toall 'whom it may concern:

Be known that I, CHAs. G. PAGE, of Washington, in the District of Columbia, have invented a Mode of Locking Cylindrical Door-Bolts, and that the following is affull,

clear, and exact description of the principle or character which distinguishes it from all other things before known and of the usual manner of making, modifying, and using the same, reference being had to the annexed drawings, of which- Figure 1, is a form of a common right and left bolt; Fig. 2, a form of a common left handed bolt; Fig. 3, a right and left handed bolt'and right-handed locking bolt Fig. 4, a section of bolt showing the loose handle and countersink; Fig. 5, an underside or back view of the bolt and guard plate; Fig. 6., a right and left bolt with oblique slot and right lookin bolt; Fi 7, a right and left bolt. and left ocking bo t; Fig. `8, a right and left bolt and ri ht locking bolt; Fig. 9, a right and left loc 'ng bolt with oblique slots; Fig., 10, a right and left locking bolt with straight slots.

improvement consists in a mode of locking cylindrical door bolts described and re resented as follows:

'g..1 represents a common form of door bolt in which the fixed knob or handle a of the bolt is lretained in the notches or cross slots l), b when the bolt is fastened or unfastenedy so as to check the longitudinal motions of the bolt and secure it when fastened against being slipped back, and to prevent the slip ing forward of the bolt when unfastenedp by accidental causes, such as the sudden swinging of the door. If we su pose the knob to be left in the horizontal s ot C when the bolt is unfastened or in the upper portion of the upright or cross slot b the sudden swinging-to of the door may throw y Y vthe bolt forward so that it will strike a hard v blow upon the back of the catch f as the door closes, or as it not unfrequently occurs, the

bolt is thrown exactly so as to enter the catch, and sometimes persons are thus bolted outk of their rooms and houses. This Fig. 1 represents what is commonly termed a right and left bolt; that is to say, a bolt which may be used on the ri ht or left side of a door and in both cases a ow the handle to be down, or in the lower portion of the cross slots b, b when the bolt is in the forward or back position.

Fig. 2 exhibits a one handed or one sided bolt, which must be placedon the left hand side of the door so that the knob may be down when the bolt is fastened or unfastened. If this bolt were reversed to the right side the knob of fthe handle would be necessarily up when the bolt was fastened or unfastened, and of course in an unsafe osition. The one handed bolt though iittle used is stronger than the light and left bolt, inasmuch as less metal is taken from the guard of the one handed bolt to form the slots. Fig. 8 represents my mode of locking this bolt when 1t is either in its forward or back position, so as eectually to prevent its being thrown out of lace by the jarring of the door, when the bo t has been drawn back, and especially to prevent the icking by thieves of the bolt when fasetne e is the bolt, a the knob or handle which instead of bein secured fast within the bolt plays loose y through the bolt for a sufficient distance to drop into the notches m m in the guard when the bolt is either in its forward o1 back position and thus securely lock the bolt.

Fig. 4 shows in section the mode of inserting and the working of the handle of the bolt. The stem n of the bolt being a little smaller than the hole throu h the bolt is long enough to drop throug the notch m in the guard and its end -is provided with a head 71., which passes readily through the notch, but can not ass back throu h the bolt. When this hea is drawn towar the bolt it ts into the countersink s in the bolt and does not interfere with the rotation of the bolt.

In Fig. 5, which is an underside or back view of the bolt and guard, it is shown that the guard is open for a considerable distance, and this allows the head to be readily formed by rivetin or hammering up, or by attaching a previous y formed head `to the end of the handle by screwing or riveting.

v Fig. 10 shows the application of the lockl to a common bolt, the only change necessary being the introduction of the loose handle a in place of the usual handle a.

Fig. 3 shows the lock applied to a left handed bolt, here inverted, to show that this bolt is convertible into a right handed bolt, for when the bolt is reversed the handle will be always down in the forward and back position of the bolt and then be like a common left handed bolt shown in Fig. 2.

Fig. 6. shows the lock a plied to a bolt having an oblique slot c in t e guard or case d, which is here shown as a right handed bolt,

Which may be converted into a left handed looking bolt by inverting it and using the look to keep the handle in place When the bolt is fastened and unfastened. When the look is applied to the bolt, Fig. 7, with a single cross slot, the bolt also becomes a right and left bolt, although it is only a left handed lookin bolt, and applied to Fig. 8 it Would make a so a right and left bolt, but only a right handed looking bolt. Ap lied to bolt of Fi V9, With the double obi ue slots, the bo t becomes a rivht and eft handed looking bolt, and so also When a plied as shown in Fig. l0 it makes a rig t and left handed looking bolt.

It Will be readily seen that by leaving o the rounded end X of the guard plate of the bolt shown in Fig. 6 such bolt may be used as a right and left bolt and also as a right and left looking bolt by inverting it. This mode of looking the bolt secures it against being revolved by jarring or other means and also against being slipped endwise by accidental or other causes.

What I claim is Looking the bolt by means of the loose handle substantially as herein set forth.

CHAS. G. PAGE .Y

Witnesses:

R. T. CAMPBELL, EDW. F. BROWN.

u LA 

